1
SY88722V
Micrel, Inc.
M9999-072505
hbwhelp@micrel.com or (408) 955-1690
DESCRIPTION
■Single 3.3V or 5V power supply
■Up to 622Mbps operation
■Modulation current to 30mA
■PECL output enable
■Differential PECL inputs
■Available in a tiny 10-pin (3mm) MSOP
FEATURES
5V/3.3V 622Mbps LASER DIODE
DRIVER WITH OUTPUT ENABLE SY88722V
APPLICATIONS
■622Mbps SONET
Rev.: B Amendment: /0
Issue Date: July 2005
The SY88722V is a high speed current switch for driving
a semiconductor laser diode in optical transmission
applications. The modulation current (IOUT) is controlled by
the current (IRSET) through the external resistor RSET. The
output OUT is HIGH and no current flows through OUT
when output enable is HIGH.
The device incorporates complementary open collector
outputs with a 30mA maximum current driving capability.
The external resistor REXT must be placed between /OUT
and VCC to dissipate the worst case power. RSER is
recommended to compensate for laser diode matching
issues. Pins 9 and 10 should be connected to achieve better
performance.
The SY88722V utilizes the high performance bipolar
ASSET™ technology.
ASSET is a trademark of Micrel, Inc.
FUNCTIONAL BLOCK DIAGRAM
REXT
VCC
/EN
/DIN
DIN
Internal
Logic
VCC
VEE
RSET
RSET
VREF
40X
RSER
IMOD
/OUT
GND
to Laser Diode
OUT
2
SY88722V
Micrel, Inc.
M9999-072505
hbwhelp@micrel.com or (408) 955-1690
Pin Number Pin Name Pin Function
1 /EN 100k PECL compatible input with 75kΩ pulldown resistor. Modulation current goes to zero
when deasserted high.
2, 3 DIN, /DIN Differential 100k PECL compatible input with 75kΩ pulldown resistors.
4 VREF Voltage reference for use with RSET.
5 RSET An external resistor from here to VREF sets the reference current for IOUT.
6 VCC Positive power supply.
7 GND Device ground.
8, 9, 10 /OUT, OUT Differential open collector current outputs.
PIN DESCRIPTION
D /D /EN OUT (Note 2) /OUT
LHLHL
HLLLH
XXHHL
Notes:
1. L = LOW, H = HIGH, X = don't care.
2. H = IOUT = 0mA.
TRUTH TABLE(Note 1)
RSET VCC65
1/EN
DIN
/DIN
VREF
10 OUT
OUT
/OUT
GND
9
8
7
2
3
4
10-Pin MSOP
(K10-1)
PACKAGE/ORDERING INFORMATION
Ordering Information
Package Operating Package Lead
Part Number Type Range Marking Finish
SY88722VKC K10-1 Commercial 722V Sn-Pb
SY88722VKCTR(1) K10-1 Commercial 722V Sn-Pb
SY88722VKG K10-1 Industrial 722V with Pb-Free
Pb-Free bar-line indicator NiPdAu
SY88722VKGTR(1) K10-1 Industrial 722V with Pb-Free
Pb-Free bar-line indicator NiPdAu
Note:
1. Tape and Reel.
3
SY88722V
Micrel, Inc.
M9999-072505
hbwhelp@micrel.com or (408) 955-1690
Absolute Maximum Ratings(Note 1)
Power Supply Voltage (VCC)............................ 0V to +7.0V
Input Voltage (VIN) .............................................. 0V to VCC
Output Current (IOUT).................................................30mA
Power Dissipation (PD) ...........................................250mW
Lead Temperature (soldering, 20 sec.) ................... +260°C
Storage Temperature Range (TS)............–55°C to +125°C
Operating Ratings(Notes 2, 3, 4)
Supply Voltage (VIN) ................................... +3.0V to +3.6V
........................................................ or +4.5V to +5.5V
Ambient Temperature (TA), Note 5 ............ –40°C to +85°C
Junction Temperature (TJ), Note 5 ............ –40°C to 100°C
Resistor to Dissipate Power (REXT) ..................10Ω to 50Ω
Laser Diode Serial Resistor (RSER) ....................0Ω to 50Ω
Resistor to Adjust Current (RSET), Note 6 . 700Ω to 20,000Ω
Package Thermal Resistance
MSOP
(θJA) Still-Air ......................................................113°C/W
(ψJB) Still-Air........................................................74°C/W
GND = 0V; VCC = 3.3V ±10% or VCC = 5.0V ±10%; TA = –40°C to +85°C
Symbol Parameter Condition Min Typ Max Units
VIH Input HIGH Voltage VCC–1.165 VCC–0.880 V
(DIN, /DIN, /EN)
VIL Input LOW Voltage VCC–1.810 VCC–1.475 V
(DIN, /DIN, /EN)
VREF Reference Voltage 1.7 2.0 2.3 V
IIL Input LOW Current VIN = VIL(min) 0.5 µA
(DIN, /DIN, /EN)
IIH Input HIGH Current 100 µA
(DIN, /DIN, /EN)
ICC Supply Current IMOD = 25mA 25 mA
IOUT_OFF Output LOW Current 450 1000 µA
(/EN = HIGH)
IOUT Modulation Current 30 mA
ARSET IOUT/IRSET 30 38 44 —
VOUT Voltage at OUT, /OUT VCC–1.4 VCC V
COUT Capacitance on OUT, /OUT 2.5 pF
Note 1. Specification for packaged product only.
DC ELECTRICAL CHARACTERISTICS(Note 1)
Note 1. Permanent device damage may occur if ABSOLUTE MAXIMUM RATINGS are exceeded. This is a stress rating only and functional operation
is not implied at conditions other than those detailed in the operational sections of this data sheet. Exposure to ABSOLUTE MAXIMUM
RATlNG conditions for extended periods may affect device reliability.
Note 2. The data sheet limits are not guaranteed if the device is operated beyond the operating ratings.
Note 3. The device is guaranteed to meet the DC specifications, shown in the table above, after thermal equilibrium has been established. The device
is tested in a socket such that transverse airflow of ≥500lfpm is maintained.
Note 4. The voltage drop across REXT and RSER plus Laser Diode must not be greater than 1.4V.
Note 5. Commercial devices are guaranteed from 0°C to +85°C ambient temperature.
Note 6. RSET minimum 430Ω.
4
SY88722V
Micrel, Inc.
M9999-072505
hbwhelp@micrel.com or (408) 955-1690
IMOD =10mA; GND = 0V; VCC = 3.3V ±10% or VCC = 5.0V ±10%; TA = 0°C to +85°C
Symbol Parameter Condition Min Typ Max Units
tPHL,tPLH D Propagation Delay IOUT = 10mA 1000 ps
DIN – OUT
tPHL,tPLH EN Propagation Delay IOUT = 10mA 1000 ps
/EN – OUT
tr, tfRise/Fall Time 400 ps
(20% to 80%)
IOR Output Current Ringing IOUT = 5 to 30mA 10 %
Note 1. Specification for packaged product only.
Note 2. REXT = RSER = 25Ω ±1%; RSER connected directly to VCC.
AC ELECTRICAL CHARACTERISTICS(Note 1, 2)
TYPICAL OPERATING CHARACTERISTICS
0
10
20
30
40
0 1.0 2.0 3.0 4.0 5.0
IMOD (mA)
RSET (kΩ)
IMOD vs. RSET
VCC = 3.3V
VCC = 5.0V
5
SY88722V
Micrel, Inc.
M9999-072505
hbwhelp@micrel.com or (408) 955-1690
10 LEAD MSOP (K10-1)
Rev. 00
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB http://www.micrel.com
The information furnished by Micrel in this datasheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use.
Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can
reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into
the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s
use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser’s own risk and Purchaser agrees to fully indemnify
Micrel for any damages resulting from such use or sale.
© 2005 Micrel, Incorporated.
